Quote Originally Posted by ricksplace View Post
It looks to me like contaminants flowed down the film while it was hung to dry, leaving the marks you see.
That's an excellent suggestion, as it would explain why the marks are along the length of the film. It may very well be that Foma 100 is more vulnerable than other 120 films I use (Neopan 400 mostly).

I will renew the stop & fixer, super-clean the development tank & the tank in which I do the final rinse (same type of tank, different one).